OBJECT WAS OVER GATWICK AIRPORT DIRECTION. IT CHANGED DIRECTION SUDDENLY A FEW TIMES AND DESCENDED AND CLIMBED INCREDIBLY QUICKLY.

IT MOST DEFINITLY WAS NOT AN AEROPLANE. ONLY A MILITARY PLANE COULD MANOUVRE ANYTHING LIKE AS FAST AS THIS BUT I CAN DISCOUNT THAT BECAUSE 1/ THE TIME BEING CLOSE TO MIDNIGHT 2/ COUPLED WITH A LOW ALTITUDE ESTIMATE;- BELOW 2000 FEET 3/ NO SOUND.